Godan verb with 'u' ending, Intransitive verb
to make war (on); to wage war (against); to go to war (with); to fight (with); to do battle (against)
esp. 戦う
おまえも決して戦う拳を忘れるな。Never lose your fighting fists. to compete (against)
esp. 戦う
to struggle (against adversities, etc.); to fight; to contend; to resist
esp. 闘う
Also written 闘う【たたかう】、斗う【たたかう】